diff --git a/.github/workflows/mypytest.yml b/.github/workflows/mypytest.yml
index beebacfb..52f610b1 100644
--- a/.github/workflows/mypytest.yml
+++ b/.github/workflows/mypytest.yml
@@ -31,6 +31,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version}}
           architecture: x86
+          update-environment: false
       ## Install the 64bits version of python3 asked
       - name: Set up Python3 ${{ matrix.python-version }} x64
         if: ${{ matrix.python-version != '2.7' }}
@@ -38,6 +39,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version}}
           architecture: x64
+          update-environment: false
 
       # Manually install python2.7 (both version at once)
       - name: Set up Python2.7 ${{ matrix.python-version }} x86 & x64